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Related Experiment Videos

Sulfonylurea signal transduction.

A E Boyd1, L Aguilar-Bryan, J Bryan

  • 1Department of Cell Biology, Baylor College of Medicine, Houston, Texas 77030.

Recent Progress in Hormone Research
|January 1, 1991
PubMed
Summary

Researchers identified a 140,000 molecular weight protein as the sulfonylurea receptor in pancreatic beta cells. This receptor is crucial for drug binding, calcium ion influx, and insulin secretion, advancing our understanding of diabetes drug mechanisms.

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Area of Science:

  • Endocrinology and Metabolism
  • Molecular Cell Biology
  • Pharmacology

Background:

  • Sulfonylurea drugs are vital for type 2 diabetes treatment, acting via pancreatic beta cells.
  • The precise molecular target of sulfonylureas in beta cells has been a long-standing question.
  • Understanding this interaction is key to optimizing diabetes therapies.

Purpose of the Study:

  • To identify and characterize the high-affinity receptor for sulfonylurea drugs in pancreatic beta cells.
  • To establish the correlation between drug binding affinity and the activation of stimulus-secretion coupling.
  • To validate the identified protein as the functional sulfonylurea receptor.

Main Methods:

  • Utilized HIT cells as a model system for studying drug-receptor interactions.

Related Experiment Videos

  • Investigated the binding affinity of glyburide and iodoglyburide to cellular components.
  • Employed ultraviolet irradiation to covalently link iodoglyburide to its receptor.
  • Solubilized and partially purified the putative receptor protein.
  • Used amino acid sequencing of proteolytic fragments to design cDNA screening probes.

    • Main Results:

    • Demonstrated a strong correlation between glyburide/iodoglyburide binding affinity and the inhibition of 86Rb+ efflux, [Ca2+]i increase, and insulin exocytosis.
    • Identified a 140,000 molecular weight (Mr 140,000) membrane protein that covalently binds iodoglyburide.
    • Confirmed that the solubilized receptor retains binding activity and the same displacement profile.
    • Partially purified the Mr 140,000 protein and obtained amino acid sequences for fragment analysis.

    Conclusions:

    • The Mr 140,000 protein is identified as the high-affinity sulfonylurea receptor responsible for mediating drug effects on pancreatic beta cells.
    • This receptor plays a critical role in regulating ATP-sensitive K+ channels, intracellular calcium levels, and insulin secretion.
    • Cloning and expression of the receptor's cDNA will enable direct functional validation and further mechanistic studies.